764365970021 has 4 divisors (see below), whose sum is σ = 764368860000. Its totient is φ = 764363080044.

The previous prime is 764365970009. The next prime is 764365970063. The reversal of 764365970021 is 120079563467.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120079563467 = 463 ⋅259351109.

It is a cyclic number.

It is not a de Polignac number, because 764365970021 - 2¹⁰ = 764365968997 is a prime.

It is a super-2 number, since 2×764365970021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (764365970821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1003241 + ... + 1592238.

It is an arithmetic number, because the mean of its divisors is an integer number (191092215000).

Almost surely, 2^764365970021 is an apocalyptic number.

It is an amenable number.

764365970021 is a deficient number, since it is larger than the sum of its proper divisors (2889979).

764365970021 is a wasteful number, since it uses less digits than its factorization.

764365970021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2889978.

The product of its (nonzero) digits is 1905120, while the sum is 50.

The spelling of 764365970021 in words is "seven hundred sixty-four billion, three hundred sixty-five million, nine hundred seventy thousand, twenty-one".